Pick up a pair of Oakley Half Jacket Sunglasses and one of the first things which will impress you right away is the weight, or lack there of. These glasses are light yet amazingly tough and more than capable of handling the demands of mountain bikers, hikers, climbers, and other outdoor enthusiasts. The innovative dual-lens Half Jacket features interchangeable lenses that allow you to adapt to the intensity of changing light conditions while wearing the same frame.